package com.laundry.shared.settings

import android.content.Context
import kotlinx.coroutines.flow.Flow
import kotlinx.coroutines.flow.flow
import java.util.*

/**
 * 系统设置管理器
 */
class SystemSettingsManager(private val context: Context) {
    
    /**
     * 获取系统配置
     */
    suspend fun getSystemConfig(): Flow<SystemConfig> = flow {
        try {
            val config = SystemConfig(
                // 基础配置
                appName = "洗护服务平台",
                appVersion = "1.0.0",
                apiVersion = "v1",
                environment = Environment.PRODUCTION,
                
                // 业务配置
                businessConfig = BusinessConfig(
                    maxOrdersPerDay = 100,
                    maxServicesPerMerchant = 50,
                    defaultCommissionRate = 0.05,
                    minDepositAmount = 5000.0,
                    maxRefundDays = 7,
                    orderTimeoutHours = 24,
                    serviceReviewTimeoutDays = 3
                ),
                
                // 支付配置
                paymentConfig = PaymentConfig(
                    enabledMethods = listOf(
                        PaymentMethodType.ALIPAY,
                        PaymentMethodType.WECHAT_PAY,
                        PaymentMethodType.BANK_CARD,
                        PaymentMethodType.BALANCE
                    ),
                    minPaymentAmount = 0.01,
                    maxPaymentAmount = 50000.0,
                    paymentTimeoutMinutes = 30,
                    autoRefundEnabled = true,
                    refundTimeoutDays = 15
                ),
                
                // 通知配置
                notificationConfig = NotificationConfig(
                    enablePushNotifications = true,
                    enableSMSNotifications = true,
                    enableEmailNotifications = true,
                    maxDailyNotifications = 50,
                    quietHoursStart = "22:00",
                    quietHoursEnd = "08:00",
                    notificationRetentionDays = 30
                ),
                
                // 安全配置
                securityConfig = SecurityConfig(
                    enableTwoFactorAuth = true,
                    passwordMinLength = 8,
                    passwordRequireSpecialChar = true,
                    maxLoginAttempts = 5,
                    lockoutDurationMinutes = 30,
                    sessionTimeoutMinutes = 120,
                    enableDeviceBinding = true,
                    enableIPWhitelist = false
                ),
                
                // 文件配置
                fileConfig = FileConfig(
                    maxFileSize = 10 * 1024 * 1024, // 10MB
                    allowedImageTypes = listOf("jpg", "jpeg", "png", "gif"),
                    allowedDocumentTypes = listOf("pdf", "doc", "docx"),
                    imageCompressionQuality = 80,
                    enableWatermark = true,
                    fileRetentionDays = 365
                ),
                
                // 缓存配置
                cacheConfig = CacheConfig(
                    enableRedisCache = true,
                    defaultCacheTimeoutMinutes = 60,
                    maxCacheSize = 1000,
                    enableLocalCache = true,
                    cacheCompressionEnabled = true
                ),
                
                // 日志配置
                logConfig = LogConfig(
                    logLevel = LogLevel.INFO,
                    enableFileLogging = true,
                    enableDatabaseLogging = true,
                    logRetentionDays = 90,
                    enableSensitiveDataMasking = true,
                    maxLogFileSize = 100 * 1024 * 1024 // 100MB
                ),
                
                // 监控配置
                monitoringConfig = MonitoringConfig(
                    enablePerformanceMonitoring = true,
                    enableErrorTracking = true,
                    enableUserBehaviorTracking = true,
                    samplingRate = 0.1,
                    alertThresholds = AlertThresholds(
                        errorRate = 0.05,
                        responseTime = 3000,
                        memoryUsage = 0.8,
                        diskUsage = 0.9
                    )
                ),
                
                lastUpdated = Date()
            )
            
            emit(config)
        } catch (e: Exception) {
            throw Exception("获取系统配置失败: ${e.message}")
        }
    }
    
    /**
     * 更新系统配置
     */
    suspend fun updateSystemConfig(config: SystemConfig): Flow<Boolean> = flow {
        try {
            // 验证配置
            val validationResult = validateSystemConfig(config)
            if (!validationResult.isValid) {
                throw Exception("配置验证失败: ${validationResult.errors.joinToString(", ")}")
            }
            
            // 保存配置
            saveSystemConfig(config)
            
            // 应用配置
            applySystemConfig(config)
            
            emit(true)
        } catch (e: Exception) {
            throw Exception("更新系统配置失败: ${e.message}")
        }
    }
    
    /**
     * 获取功能开关配置
     */
    suspend fun getFeatureFlags(): Flow<Map<String, Boolean>> = flow {
        try {
            val flags = mapOf(
                "enable_new_ui" to true,
                "enable_ai_customer_service" to true,
                "enable_voice_recognition" to false,
                "enable_face_recognition" to true,
                "enable_location_tracking" to true,
                "enable_push_notifications" to true,
                "enable_sms_verification" to true,
                "enable_email_verification" to true,
                "enable_social_login" to true,
                "enable_guest_mode" to false,
                "enable_offline_mode" to true,
                "enable_dark_mode" to true,
                "enable_multi_language" to true,
                "enable_accessibility" to true,
                "enable_analytics" to true,
                "enable_crash_reporting" to true,
                "enable_performance_monitoring" to true,
                "enable_ab_testing" to false,
                "enable_beta_features" to false,
                "enable_debug_mode" to false
            )
            
            emit(flags)
        } catch (e: Exception) {
            emit(emptyMap())
        }
    }
    
    /**
     * 更新功能开关
     */
    suspend fun updateFeatureFlag(flagName: String, enabled: Boolean): Flow<Boolean> = flow {
        try {
            // 保存功能开关状态
            saveFeatureFlag(flagName, enabled)
            
            // 应用功能开关
            applyFeatureFlag(flagName, enabled)
            
            emit(true)
        } catch (e: Exception) {
            emit(false)
        }
    }
    
    /**
     * 获取地区配置
     */
    suspend fun getRegionConfig(): Flow<RegionConfig> = flow {
        try {
            val config = RegionConfig(
                supportedRegions = listOf(
                    Region("CN", "中国", "zh-CN", "CNY", "+86"),
                    Region("US", "美国", "en-US", "USD", "+1"),
                    Region("JP", "日本", "ja-JP", "JPY", "+81")
                ),
                defaultRegion = "CN",
                enableRegionDetection = true,
                enableCurrencyConversion = true,
                enableMultiLanguage = true,
                timeZones = mapOf(
                    "CN" to "Asia/Shanghai",
                    "US" to "America/New_York",
                    "JP" to "Asia/Tokyo"
                )
            )
            
            emit(config)
        } catch (e: Exception) {
            throw Exception("获取地区配置失败: ${e.message}")
        }
    }
    
    /**
     * 获取第三方服务配置
     */
    suspend fun getThirdPartyConfig(): Flow<ThirdPartyConfig> = flow {
        try {
            val config = ThirdPartyConfig(
                // 地图服务
                mapServices = MapServiceConfig(
                    primaryProvider = "amap",
                    backupProvider = "baidu",
                    apiKeys = mapOf(
                        "amap" to "your_amap_key",
                        "baidu" to "your_baidu_key",
                        "google" to "your_google_key"
                    ),
                    enableLocationCache = true,
                    locationCacheTimeoutMinutes = 30
                ),
                
                // 支付服务
                paymentServices = PaymentServiceConfig(
                    alipay = AlipayConfig(
                        appId = "your_alipay_app_id",
                        privateKey = "your_private_key",
                        publicKey = "alipay_public_key",
                        signType = "RSA2",
                        environment = "production"
                    ),
                    wechatPay = WechatPayConfig(
                        appId = "your_wechat_app_id",
                        mchId = "your_merchant_id",
                        apiKey = "your_api_key",
                        certPath = "/path/to/cert.p12",
                        environment = "production"
                    )
                ),
                
                // 短信服务
                smsService = SMSServiceConfig(
                    provider = "aliyun",
                    accessKeyId = "your_access_key_id",
                    accessKeySecret = "your_access_key_secret",
                    signName = "洗护服务",
                    templateCodes = mapOf(
                        "verification" to "SMS_123456789",
                        "order_notification" to "SMS_987654321"
                    ),
                    dailyLimit = 1000,
                    enableInternational = false
                ),
                
                // 推送服务
                pushService = PushServiceConfig(
                    fcm = FCMConfig(
                        serverKey = "your_fcm_server_key",
                        senderId = "your_sender_id",
                        enableBatching = true,
                        batchSize = 100
                    ),
                    apns = APNSConfig(
                        keyId = "your_key_id",
                        teamId = "your_team_id",
                        bundleId = "com.laundry.app",
                        keyPath = "/path/to/key.p8",
                        environment = "production"
                    )
                ),
                
                // 云存储服务
                storageService = StorageServiceConfig(
                    provider = "aliyun_oss",
                    endpoint = "https://oss-cn-hangzhou.aliyuncs.com",
                    accessKeyId = "your_access_key_id",
                    accessKeySecret = "your_access_key_secret",
                    bucketName = "laundry-files",
                    enableCDN = true,
                    cdnDomain = "https://cdn.laundry.com"
                ),
                
                // 分析服务
                analyticsService = AnalyticsServiceConfig(
                    provider = "google_analytics",
                    trackingId = "UA-XXXXXXXXX-X",
                    enableEcommerce = true,
                    enableCustomEvents = true,
                    samplingRate = 100
                )
            )
            
            emit(config)
        } catch (e: Exception) {
            throw Exception("获取第三方服务配置失败: ${e.message}")
        }
    }
    
    /**
     * 获取维护模式配置
     */
    suspend fun getMaintenanceConfig(): Flow<MaintenanceConfig> = flow {
        try {
            val config = MaintenanceConfig(
                isMaintenanceMode = false,
                maintenanceMessage = "系统维护中，预计恢复时间：2024-01-01 06:00",
                allowedIPs = listOf("127.0.0.1", "192.168.1.0/24"),
                allowedUserIds = listOf("admin", "developer"),
                maintenanceStartTime = null,
                maintenanceEndTime = null,
                enablePartialMaintenance = false,
                maintenanceModules = emptyList()
            )
            
            emit(config)
        } catch (e: Exception) {
            throw Exception("获取维护模式配置失败: ${e.message}")
        }
    }
    
    /**
     * 设置维护模式
     */
    suspend fun setMaintenanceMode(
        enabled: Boolean,
        message: String = "",
        startTime: Date? = null,
        endTime: Date? = null
    ): Flow<Boolean> = flow {
        try {
            val config = MaintenanceConfig(
                isMaintenanceMode = enabled,
                maintenanceMessage = message,
                maintenanceStartTime = startTime,
                maintenanceEndTime = endTime,
                allowedIPs = listOf("127.0.0.1"),
                allowedUserIds = listOf("admin")
            )
            
            saveMaintenanceConfig(config)
            
            // 通知所有连接的客户端
            notifyMaintenanceMode(enabled, message)
            
            emit(true)
        } catch (e: Exception) {
            emit(false)
        }
    }
    
    // 私有方法
    private fun validateSystemConfig(config: SystemConfig): ConfigValidationResult {
        val errors = mutableListOf<String>()
        
        // 验证业务配置
        if (config.businessConfig.maxOrdersPerDay <= 0) {
            errors.add("每日最大订单数必须大于0")
        }
        
        if (config.businessConfig.defaultCommissionRate < 0 || config.businessConfig.defaultCommissionRate > 1) {
            errors.add("默认佣金率必须在0-1之间")
        }
        
        // 验证支付配置
        if (config.paymentConfig.minPaymentAmount <= 0) {
            errors.add("最小支付金额必须大于0")
        }
        
        if (config.paymentConfig.maxPaymentAmount <= config.paymentConfig.minPaymentAmount) {
            errors.add("最大支付金额必须大于最小支付金额")
        }
        
        // 验证安全配置
        if (config.securityConfig.passwordMinLength < 6) {
            errors.add("密码最小长度不能少于6位")
        }
        
        return ConfigValidationResult(errors.isEmpty(), errors)
    }
    
    private fun saveSystemConfig(config: SystemConfig) {
        // 保存配置到数据库或配置文件
    }
    
    private fun applySystemConfig(config: SystemConfig) {
        // 应用配置到系统
    }
    
    private fun saveFeatureFlag(flagName: String, enabled: Boolean) {
        // 保存功能开关状态
    }
    
    private fun applyFeatureFlag(flagName: String, enabled: Boolean) {
        // 应用功能开关
    }
    
    private fun saveMaintenanceConfig(config: MaintenanceConfig) {
        // 保存维护模式配置
    }
    
    private fun notifyMaintenanceMode(enabled: Boolean, message: String) {
        // 通知客户端维护模式状态
    }
}

data class ConfigValidationResult(val isValid: Boolean, val errors: List<String>)
